File:Chamaeleon I cloud.png
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Size of this preview: 550 × 599 pixels. Other resolutions: 220 × 240 pixels | 441 × 480 pixels | 727 × 792 pixels.
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[edit]DescriptionChamaeleon I cloud.png |
English: This image shows a ROSAT PSPC false-color image of the Chamaeleon I dark cloud, a well-known site of star formation. The contours show the 100 micron emission from dust in this cloud as measured by the infrared IRAS satellite. This image was made from X-rays with energies between 500 eV and 1100 eV. Since these soft (low energy) X-rays are absorbed by interstellar dust and gas, the observation of a "shadow" provides an indication of the intensity of X-rays coming from behind the absorbing cloud. X-ray "shadows" like this are the X-ray analog of well-known optical dark nebulae such as the Horsehead Nebula, produced by absorption in a dark cloud of optical photons emitted in a bright nebula behind the cloud. In the X-ray case, the entire sky is bright with a diffuse glow known as the diffuse X-ray background (somewhat like the night sky as seen from a modern city, where scattered light from street lamps produces a bright glow in the sky and washes out all but the brightest stars). Observations like this will help us understand the source of the diffuse X-ray background at these energies, which is known to be different from the 1/4 keV diffuse background shown in our image of the Draco nebula in this directory. |
Date | |
Source | HEASARC ROSAT Guest Observer Facility, url=http://heasarc.nasa.gov/docs/rosat/gallery/misc_shadow_cham.html |
Author | This work was done by Dr. David Burrows and graduate student Jeff Mendenhall of the Penn State Department of Astronomy & Astrophysics, and is based on a mosaic of images collected by Dr. Burrows and by Dr. Eric Feigelson of Penn State using the US/German ROSAT satellite. |
Permission (Reusing this file) |
Images from NASA usually are free of copyright. |
Curator: Michael Arida (SP Sys); arida@milkyway.gsfc.nasa.gov HEASARC Guest Observer Facility
Licensing
[edit]Public domainPublic domainfalsefalse |
This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ||
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Original upload log
[edit]Date/Time | Dimensions | User | Comment |
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29 December 2009, 00:51:08 | 727 × 792 (186530 bytes) | Marshallsumter (talk · contribs) | {{Information |Description={{en|1=This image shows a ROSAT PSPC false-color image of the Chamaeleon I dark cloud, a well-known site of star formation. The contours show the 100 micron emission from dust in this cloud as measured by the infrared IRAS satel |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 07:00, 21 November 2014 | 727 × 792 (116 KB) | GifTagger (talk | contribs) | Bot: Converting file to superior PNG file. (Source: Chamaeleon_I_cloud.gif). This GIF was problematic due to non-greyscale color table. |
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